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THE INTERNATIONAL SPACE STATION HAS BEEN ORBITING FOR 7,000 DAYS

The International Space Station is a large spacecraft that orbits Earth's atmosphere about 220 miles above the planet's surface. Friday marks the ISS's 7,000th day in orbit. In those 7,000 days, the outpost has seen its ups and downs; here’s a run-through of some of the biggest highlights. 1998: The construction of the ISS began on November 20, 1998, and was a result of international efforts involving 16 countries, the BBC reported. More